xp WON'T auto renew IP address after lease

[Guest]

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xp WON'T auto renew IP address after lease ........HELP........
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ISP = comcast , CABLE MODEM = linksys , OS = xp pro

ALL LAST YEAR, my ISP was changing my IP lease date/time
every X-hours, if I was conncected WHILE my lease expired,
my address remained the SAME, and only the lease date/time
was extended another x-hours. This worked fine.

BUT THIS YEAR, my isp ( every X-hours ) is changing the IP
address ALONG with the date/time change ( kicking me off-line ).

XP should AUTO renew the new IP address for me, but WHEN
XP tries, it defaults to 169.x.y.z ( wrong IP address ) stopping
access to the internet.

TO COUNTER THIS, I reboot the system just AFTER the lease
expires to let XP find the new IP address so I can re-connect
to internet, UNTIL this new lease expires again.

X-hours is between 2-100 hours ( depending on maintenance ).
Cable modem tested and is working. MUST BE XP PROBLEM.

 

[Doug Sherman [MVP]]

What happens if before the lease expires you run:

ipconfig /release

ipconfig /renew

Doug Sherman
MCSE, MCSA, MCP+I, MVP

 

[Guest]

HI DOUG,

both /switches are working
IPconfig /release ( lets go of current address )
IPconfig /renew ( same ip settings as before )

BUT, comcast will change IP in the future,
IF I'm still connected,
shouldn't XP capture the NEW ip address,
so I don't see a disconnect problem ?

 

[Doug Sherman [MVP]]

Yes, XP should get the new address automatically. However, if your ISP is
playing games with variable lease durations and cycling IPs out of the
available range; then when a DHCP client already has an IP and attempts to
renew it, it is likely to receive a NACK response. This results in a longer
broadcast conversation between the client and the server and increases the
chance of collisions, lost/dropped packets, etc. If you periodically
release and renew, you 'should' be able to avoid lease expiration. This is
more a case of your ISP maximizing the chances of lease negotiation failure
than a 'Windows' problem. The DHCP process is defined and governed by
various RFCs; it is not controlled by Microsoft or Windows.

Doug Sherman
MCSE, MCSA, MCP+I, MVP